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<br /> <br />. r" C ' <br />j.v J~ <br /> <br />38 <br /> <br />\IETROI'OLlT.\'4 V. ,\TEIl. IlISTHICT <br /> <br />~~' <br /> <br />- - <br /> <br />, <br /> <br />"~ <br /> <br />- - <br /> <br /> <br />Lake .lfelthews with 9,1';";00 Cl,f. in storaf/(' <br /> <br />through a gate towel'. The necessary l'ontrolled l'elease from the <br />manifold is accomplisht'd. by means of 8:!-inch diameter hOl'izontal <br />cylinder ,'al\'cs, which discharge into the forehay pool. Two of an <br />ultimate ten relelule \'al\'es nre now in service. A \'enturi meter <br />in the pipe line din.><:tly l*yol1rl the forebay measures the flow into <br />the uppt.'r feMeI'. <br />The upper feeder is operaterl without shut-off vl\lves betwt.'en <br />the headworks gate tower and the Eagle I~ock control towel", a dis- <br />tance of 60.8 miles. and water which has heen relea::;ed at the head- <br />works must continue to its terminal destinations unless tUl"Ilerl out <br />of the line at a spillway 01' blow-olT. As explained in the second <br />mmual report. consider:ltions of et.'onomy dictated that the upper <br />feeder pipe lines be designed for the hydraulic gradient correspond- <br />ing to unobstructed conveYllllce of maximum required flow, because <br />of the excessive increase in cost if the large diametet. pipe lines <br />were built to withstand the static and surge pressures which would <br />result from closure of main line \'al\'Cs. The desi}med capacity of <br />the upper feeder is 7;'0 cubic feet per second between Lake )lathews <br />and 5<ln Dimas. and 510 cubic feet per second between the latter <br />point and the Ea~le Hock control tower. <br /> <br />